howto: implement dynamic versioning

1 files changed, 35 insertions, 0 deletions

diff --git a/gr-howto-write-a-block/config/gr_git.m4 b/gr-howto-write-a-block/config/gr_git.m4
new file mode 100644
index 000000000..5fe424808
--- /dev/null
+++ b/gr-howto-write-a-block/config/gr_git.m4
@@ -0,0 +1,35 @@
+dnl Copyright 2009 Free Software Foundation, Inc.
+dnl 
+dnl This file is part of GNU Radio
+dnl 
+dnl GNU Radio is free software; you can redistribute it and/or modify
+dnl it under the terms of the GNU General Public License as published by
+dnl the Free Software Foundation; either version 3, or (at your option)
+dnl any later version.
+dnl 
+dnl GNU Radio is distributed in the hope that it will be useful,
+dnl but WITHOUT ANY WARRANTY; without even the implied warranty of
+dnl MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+dnl GNU General Public License for more details.
+dnl 
+dnl You should have received a copy of the GNU General Public License
+dnl along with GNU Radio; see the file COPYING.  If not, write to
+dnl the Free Software Foundation, Inc., 51 Franklin Street,
+dnl Boston, MA 02110-1301, USA.
+
+
+AC_DEFUN([GR_GIT],[
+  dnl Identify git binary
+  AC_PATH_PROG([GIT],[git])
+  
+  dnl If it exists, get either 'git describe' or fallback to current commit
+  if test x$GIT != x ; then
+    if (cd $srcdir && $GIT describe >/dev/null 2>&1); then
+      GIT_VERSION=`cd $srcdir && $GIT describe --abbrev=8 | cut -f 2- -d '-'`
+    else
+      if (cd $srcdir && $GIT describe --always --abbrev=8 >/dev/null 2>&1); then
+        GIT_VERSION=`cd $srcdir && $GIT describe --always --abbrev=8`
+      fi
+    fi
+  fi
+])